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Re: Subject: Re: Help with authz-regexp mapping kerberos identity to dn --RAHUL

Thank you again..I will try this expression you have provided.
Am I going about this in the correct way? What I want is to login
through ssh or even the local box and be authenticated by the kerberos
credentials. But I want the effective uid or account to be that of the
ldap user in the openldap directory. 
I want my kerberos credentials to authorize my ldap login even though
the account names do not match. Is it possible with this authz-regexp?
Or is this simply for services. 
Sorry for all the questions.



Message: 1
Date: Wed, 13 Aug 2008 15:08:43 +0530
From: Rahul Amaram <rahul@synovel.com>
Subject: Re: Subject: Re: Help with authz-regexp mapping kerberos
	identity	to dn	--RAHUL
Cc: openldap-technical@openldap.org
Message-ID: <48A2ABA3.9090900@synovel.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi Chavez,
Try this expression. It should work.

authz-regexp uid=(.).*_([^,]*),cn=company.com,cn=gssapi,cn=auth

The "sasl-realm" parameter is set in /etc/slapd/slapd.conf (main
slapd.conf file). You might also be interested in sasl-host (for
hard-coding the host sasl fqdn name to be used while fetching
ldap/<fqdn>@<REALM> password from the keytab file) and sasl-secprops


Chavez, James R. wrote:
> Rahul,
> My friend finally a response.
> Thank you for the input I had also read that link you provided, it was

> somewhat helpful. If the usernames were identical that would work 
> great I believe. However the source name is coming in as joe_montana 
> and I need it to map to jmontana.
> So I need only the first character of the first name and everything 
> after the underscore (last name). I am looking for the expression that

> would give me that. I am not too familiar with the expressions syntax 
> or how to manipulate them. I see there is an option to search ldap 
> using ldap:///ou=people,dc=example,dc=com??one?(uid=$1), maybe I 
> should look into that. Do you have any suggestions or source for 
> reading on authz-regexp? I have been looking. If it was shell 
> scripting I could manage another way.
> When you say the SASL Realm would that go in the main slapd.conf or 
> the /usr/lib/sasl2/slapd.conf?
> I am indeed using GSSAPI for the SASL-auth-mechanism. I am getting 
> close,just gotta get past this. :)
> Thank you again.
> James
> ------------------------------
> Message: 2
> Date: Mon, 11 Aug 2008 17:54:02 +0530
> From: Rahul Amaram <rahul@synovel.com>
> Subject: Re: Help with authz-regexp mapping kerberos identity to dn
> 	....SASL
> To: openldap-technical@openldap.org
> Message-ID: <48A02F62.1000305@synovel.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> Hi Chavez,
> This is the authz-regexp string I have used in slapd.conf:
> authz-regexp uid=([^,]*),cn=synovel.com,cn=gssapi,cn=auth
> uid=$1,ou=People,dc=synovel,dc=com
> This works if the SASL auth mechanism is gssapi. I have also 
> hard-coded the SASL Realm with the below config option:
> sasl-realm SYNOVEL.COM
> If it uses the default realm (i.e. sasl-realm option is missing) then 
> the string would probably be:
> authz-regexp uid=([^,]*),cn=gssapi,cn=auth 
> uid=$1,ou=People,dc=synovel,dc=com
> Hope this is of some assistance. For furthur information, kindly read
> http://www.openldap.org/doc/admin24/sasl.html#Mapping%20Authentication
> %2
> 0Identities
> .
> Regards,
> Rahul.
> Chavez, James R. wrote:
>> Hello all,
>> My plan is to use Kerberos and LDAP as a replacement for NIS.
>> My issue is that I need my kerberos credentials to map to a user in
>> so I can avoid permission issues when logging in with kerberos creds.
>> All the perms are based on the UNIX/LDAP users and groups. Thing is
> the
>> user id's are different between kerberos and LDAP.
>> The kerberos names consist of firstname_lastname@REALM. The ldap
> entries
>> are in the format of standard Unix user names or first letter of 
>> first name and up to 7 characters of the last name (jmontana). I 
>> migrated
> the
>> LDAP entries from my existing NIS maps.
>> Now I understand that I can use SASL and authz-regexp in slapd.conf 
>> to map these id's. Please correct me if I am wrong.
>> I added all the corresponding  "krbName: first_last@REALM" to the
> users
>> when I added them to the LDAP directory.
>> For example for user Joe Montana..His ldap dn is "dn:
>> uid=jmontana,ou=People,dc=test,dc=example,dc=com"
>> His uid is "uid: jmontana
>> And his Krb name is ""krbName: joe_montana@TEST.EXAMPLE.COM"
>> I think all the data is there to get a mapping I just am unsure of 
>> the auth-regexp strings I need to add to the slapd.conf file.
>> Does anyone out there have any experience with this and better yet 
>> provide the string or example of what strings I can use?
>> I have searched the net on how to authenticate with kerberos and 
>> effictively login with a local id but have been unsuccessful in my 
>> search.
>> Appreciate any help.
>> Thank You
>> James

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